Characterisation and preliminary quantification of the methane reservoir in a coastal sedimentary source: San Simón Bay, Ría de Vigo, NW Spain

García‐Gil, Soledad; Blas, E. de; Martínez-Carreño, Natalia; Iglesias, Jorge; Rial-Otero, R.; Simal‐Gándara, Jesús; Judd, Alan

doi:10.1016/j.ecss.2010.10.038

Cited by 28 publications

(10 citation statements)

References 46 publications

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“…Continental shelves are regions in which marine methane production takes place on a large scale and evidence for the presence of methane in such areas has been presented in numerous studies around the world (e.g., Laier and Jensen 2007;Fleischer et al 2001;Schubert et al 2006;Weschenfelder et al 2006;Duarte et al 2007;Huang et al 2009;Jones et al 2010;Schneider von Deimling et al 2010;Garcia-Gil et al 2011;Weber et al 2014). The probability of its occurrence is at its highest in coastal regions with significant river inflow, high primary production, and hypoxic/anoxic conditions in bottom waters, which together creates favorable conditions for methanogenesis in sediments (Davis 1992;Claypool and Kaplan 1974).…”

Section: Introductionmentioning

confidence: 99%

Acoustic investigations of shallow gas in the southern Baltic Sea (Polish Exclusive Economic Zone): a review

et al. 2018

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This paper synthesizes, compares, and discusses acoustic data pertaining to the presence of gas in sediments within the Polish Exclusive Economic Zone in the southern Baltic Sea, which are scattered among different journals, some of which are difficult to access and therefore have limited availability to a wider group of readers. It includes data collected between the 1970s and the present day, collected using different acoustic measurement devices. A majority of reported acoustic manifestations of gas presence in sediments in the Polish EEZ take the form of acoustic blanking followed by layer enhancement, acoustic turbidity, and increased acoustic energy absorption. The observed morphological structures related to gas presence are pockmarks (shallow and buried-17 km 2), gas-saturated sediments, gas pockets, and gas chimneys. The estimated total area of acoustic manifestation of shallow gas in the Polish EEZ is around 700 km 2. Geochemical analyses of surface sediments demonstrated strong correlation with acoustic data and revealed that methane occurs at relatively shallow depths compared with other regions of the Baltic Sea.

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Section: Introductionmentioning

confidence: 99%

Acoustic investigations of shallow gas in the southern Baltic Sea (Polish Exclusive Economic Zone): a review

et al. 2018

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“… (main ria basin) and García‐Gil et al . (San Simón Bay). Therefore, they are in a key position for improving the general stratigraphical correlation (Fig.…”

Section: Discussionmentioning

confidence: 99%

Environmental change in theRía deVigo,NW Iberia, since the mid‐Holocene: new palaeoecological and seismic evidence

Sobrino

García‐Gil

Iglesias

et al. 2012

Boreas

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“…This study was conducted on samples from three gravity cores retrieved from three sampling stations in the Ría de Vigo (Fig. ) aboard the research vessel Mytillus of the Spanish National Research Council in November 2012, according to the distribution of gas fields previously mapped in the Ría de Vigo . Two of them (C8‐GI and C11‐GO) were located inside the mapped gas fields.…”

Section: Methodsmentioning

confidence: 99%

“…3), which ranged from 8 to 20. Core C8-GI had the highest ratios (11)(12)(13)(14)(15)(16)(17)(18)(19)(20), showing a major terrestrial input of the OM. The lowest TOC/TN ratios (<13) were found in C10-NO and C11-GO, suggesting a higher marine input in the OM content.…”

Section: General Characteristics Of the Sedimentsmentioning

confidence: 99%

Sulfur, Iron, and Manganese Speciation in Anoxic Sediments with Methane (Ría de Vigo, NW Spain)

Ramírez-Pérez

Blas

García‐Gil

2017

CLEAN Soil Air Water

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High sedimentation rates and high organic matter contents promote the development of anoxic conditions in the Ría de Vigo (NW Spain). In these anoxic environments, elements such as S, Fe, and Mn are involved in redox processes affecting the CH4 dynamic. In this work, speciation of S, Fe, and Mn was evaluated through a five‐step sequential extraction procedure (exchangeable form and bound to carbonate, present in the reductive phase bound to Fe/Mn oxides, weakly bound to organic matter, strongly bound to organic matter, and residual fractions) in order to identify the origin of S, Fe, and Mn, distinguishing between fractions bound to organic compounds from those in the sulfide phase in these anoxic sediments. The study was conducted on samples from three gravity cores retrieved in the inner and outer zones of the ría in November 2012. S was mainly found in the fraction strongly bound to organic matter, showing that S is incorporated in the organic matter. However, the S in this fraction was associated with total organic carbon only in the inner zone (r = 0.833). More than 65% of total Fe and Mn was found in the residual fraction at all zones, being the highest in the outer zone, and showing an intense diagenesis in the ría, where precipitation of these elements as sulfides is favored by anoxic conditions. SO42− reduction, Fe and Mn reduction processes coexist in the same area within the cores.

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Characterisation and preliminary quantification of the methane reservoir in a coastal sedimentary source: San Simón Bay, Ría de Vigo, NW Spain

Cited by 28 publications

References 46 publications

Acoustic investigations of shallow gas in the southern Baltic Sea (Polish Exclusive Economic Zone): a review

Acoustic investigations of shallow gas in the southern Baltic Sea (Polish Exclusive Economic Zone): a review

Environmental change in theRía deVigo,NW Iberia, since the mid‐Holocene: new palaeoecological and seismic evidence

Sulfur, Iron, and Manganese Speciation in Anoxic Sediments with Methane (Ría de Vigo, NW Spain)

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